k+o2 =k2o
k2o+h2o=2koh
2koh+h2so4= k2so4+2h2o
k2so4+ ba(oh)2= baso4+ 2koh
2Cu + O₂ = 2CuO
CuO + H₂SO₄ = CuSO₄ + H₂O
CuSO₄ + BaCl₂ = CuCl₂ + BaSO₄↓
СuSO₄ + 2NaOH = Cu(OH)₂ + Na₂SO₄
Cu(OH)₂ = CuO+H₂
O
CuO + 2HCl = CuCl₂ + H₂
O
CuCl₂ + 2AgNO₃ = 2AgCl↓ + Cu(NO₃)₂
Удачи! :-)
